/*
 * Copyright (C) 2005-2011 MaNGOS <http://www.getmangos.com/>
 *
 * Copyright (C) 2008-2011 Trinity <http://www.trinitycore.org/>
 *
 * Copyright (C) 2010-2011 ProjectSkyfire <http://www.projectskyfire.org/>
 * 
 * Copyright (C) 2011 ArkCORE <http://www.arkania.net/>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef _BYTEBUFFER_H
#define _BYTEBUFFER_H

#include "Common.h"
#include "Debugging/Errors.h"
#include "Logging/Log.h"
#include "Utilities/ByteConverter.h"

class ByteBufferException {
public:
	ByteBufferException(bool _add, size_t _pos, size_t _esize, size_t _size) :
			add(_add), pos(_pos), esize(_esize), size(_size) {
		PrintPosError();
	}

	void PrintPosError() const {
		sLog->outError(
				"Attempted to %s in ByteBuffer (pos: " SIZEFMTD " size: "SIZEFMTD") value with size: " SIZEFMTD,
				(add ? "put" : "get"), pos, size, esize);
	}
private:
	bool add;
	size_t pos;
	size_t esize;
	size_t size;
};

class ByteBuffer {
public:
	const static size_t DEFAULT_SIZE = 0x1000;

	// constructor
	ByteBuffer() :
			_rpos(0), _wpos(0) {
		_storage.reserve(DEFAULT_SIZE);
	}

	// constructor
	ByteBuffer(size_t res) :
			_rpos(0), _wpos(0) {
		_storage.reserve(res);
	}

	// copy constructor
	ByteBuffer(const ByteBuffer &buf) :
			_rpos(buf._rpos), _wpos(buf._wpos), _storage(buf._storage) {
	}

	void clear() {
		_storage.clear();
		_rpos = _wpos = 0;
	}

	template<typename T> void append(T value) {
		EndianConvert(value);
		append((uint8 *) &value, sizeof(value));
	}

	template<typename T> void put(size_t pos, T value) {
		EndianConvert(value);
		put(pos, (uint8 *) &value, sizeof(value));
	}

	ByteBuffer &operator<<(uint8 value) {
		append<uint8>(value);
		return *this;
	}

	ByteBuffer &operator<<(uint16 value) {
		append<uint16>(value);
		return *this;
	}

	ByteBuffer &operator<<(uint32 value) {
		append<uint32>(value);
		return *this;
	}

	ByteBuffer &operator<<(uint64 value) {
		append<uint64>(value);
		return *this;
	}

	// signed as in 2e complement
	ByteBuffer &operator<<(int8 value) {
		append<int8>(value);
		return *this;
	}

	ByteBuffer &operator<<(int16 value) {
		append<int16>(value);
		return *this;
	}

	ByteBuffer &operator<<(int32 value) {
		append<int32>(value);
		return *this;
	}

	ByteBuffer &operator<<(int64 value) {
		append<int64>(value);
		return *this;
	}

	// floating points
	ByteBuffer &operator<<(float value) {
		append<float>(value);
		return *this;
	}

	ByteBuffer &operator<<(double value) {
		append<double>(value);
		return *this;
	}

	ByteBuffer &operator<<(const std::string &value) {
		append((uint8 const *) value.c_str(), value.length());
		append((uint8) 0);
		return *this;
	}

	ByteBuffer &operator<<(const char *str) {
		append((uint8 const *) str, str ? strlen(str) : 0);
		append((uint8) 0);
		return *this;
	}

	ByteBuffer &operator>>(bool &value) {
		value = read<char>() > 0 ? true : false;
		return *this;
	}

	ByteBuffer &operator>>(uint8 &value) {
		value = read<uint8>();
		return *this;
	}

	ByteBuffer &operator>>(uint16 &value) {
		value = read<uint16>();
		return *this;
	}

	ByteBuffer &operator>>(uint32 &value) {
		value = read<uint32>();
		return *this;
	}

	ByteBuffer &operator>>(uint64 &value) {
		value = read<uint64>();
		return *this;
	}

	//signed as in 2e complement
	ByteBuffer &operator>>(int8 &value) {
		value = read<int8>();
		return *this;
	}

	ByteBuffer &operator>>(int16 &value) {
		value = read<int16>();
		return *this;
	}

	ByteBuffer &operator>>(int32 &value) {
		value = read<int32>();
		return *this;
	}

	ByteBuffer &operator>>(int64 &value) {
		value = read<int64>();
		return *this;
	}

	ByteBuffer &operator>>(float &value) {
		value = read<float>();
		return *this;
	}

	ByteBuffer &operator>>(double &value) {
		value = read<double>();
		return *this;
	}

	ByteBuffer &operator>>(std::string& value) {
		value.clear();
		while (rpos() < size()) // prevent crash at wrong string format in packet
		{
			char c = read<char>();
			if (c == 0)
				break;
			value += c;
		}
		return *this;
	}

	uint8 operator[](size_t pos) const {
		return read<uint8>(pos);
	}

	size_t rpos() const {
		return _rpos;
	}

	size_t rpos(size_t rpos_) {
		_rpos = rpos_;
		return _rpos;
	}

	void rfinish() {
		_rpos = wpos();
	}

	size_t wpos() const {
		return _wpos;
	}

	size_t wpos(size_t wpos_) {
		_wpos = wpos_;
		return _wpos;
	}

	template<typename T>
	void read_skip() {
		read_skip(sizeof(T));
	}

	void read_skip(size_t skip) {
		if (_rpos + skip > size())
			throw ByteBufferException(false, _rpos, skip, size());
		_rpos += skip;
	}

	template<typename T> T read() {
		T r = read<T>(_rpos);
		_rpos += sizeof(T);
		return r;
	}

	template<typename T> T read(size_t pos) const {
		if (pos + sizeof(T) > size())
			throw ByteBufferException(false, pos, sizeof(T), size());
		T val = *((T const*) &_storage[pos]);
		EndianConvert(val);
		return val;
	}

	void read(uint8 *dest, size_t len) {
		if (_rpos + len > size())
			throw ByteBufferException(false, _rpos, len, size());
		memcpy(dest, &_storage[_rpos], len);
		_rpos += len;
	}

	void readPackGUID(uint64& guid) {
		if (rpos() + 1 > size())
			throw ByteBufferException(false, _rpos, 1, size());

		guid = 0;

		uint8 guidmark = 0;
		(*this) >> guidmark;

		for (int i = 0; i < 8; ++i) {
			if (guidmark & (uint8(1) << i)) {
				if (rpos() + 1 > size())
					throw ByteBufferException(false, _rpos, 1, size());

				uint8 bit;
				(*this) >> bit;
				guid |= (uint64(bit) << (i * 8));
			}
		}
	}

	const uint8 *contents() const {
		return &_storage[0];
	}

	size_t size() const {
		return _storage.size();
	}
	bool empty() const {
		return _storage.empty();
	}

	void resize(size_t newsize) {
		_storage.resize(newsize);
		_rpos = 0;
		_wpos = size();
	}

	void reserve(size_t ressize) {
		if (ressize > size())
			_storage.reserve(ressize);
	}

	void append(const std::string& str) {
		append((uint8 const*) str.c_str(), str.size() + 1);
	}

	void append(const char *src, size_t cnt) {
		return append((const uint8 *) src, cnt);
	}

	template<class T> void append(const T *src, size_t cnt) {
		return append((const uint8 *) src, cnt * sizeof(T));
	}

	void append(const uint8 *src, size_t cnt) {
		if (!cnt)
			return;

		ASSERT(size() < 10000000);

		if (_storage.size() < _wpos + cnt)
			_storage.resize(_wpos + cnt);
		memcpy(&_storage[_wpos], src, cnt);
		_wpos += cnt;
	}

	void append(const ByteBuffer& buffer) {
		if (buffer.wpos())
			append(buffer.contents(), buffer.wpos());
	}

	// can be used in SMSG_MONSTER_MOVE opcode
	void appendPackXYZ(float x, float y, float z) {
		uint32 packed = 0;
		packed |= ((int) (x / 0.25f) & 0x7FF);
		packed |= ((int) (y / 0.25f) & 0x7FF) << 11;
		packed |= ((int) (z / 0.25f) & 0x3FF) << 22;
		*this << packed;
	}

	void appendPackGUID(uint64 guid) {
		uint8 packGUID[8 + 1];
		packGUID[0] = 0;
		size_t size = 1;
		for (uint8 i = 0; guid != 0; ++i) {
			if (guid & 0xFF) {
				packGUID[0] |= uint8(1 << i);
				packGUID[size] = uint8(guid & 0xFF);
				++size;
			}

			guid >>= 8;
		}
		append(packGUID, size);
	}

	void put(size_t pos, const uint8 *src, size_t cnt) {
		if (pos + cnt > size())
			throw ByteBufferException(true, pos, cnt, size());
		memcpy(&_storage[pos], src, cnt);
	}

	void print_storage() const {
		if (!sLog->IsOutDebug()) // optimize disabled debug output
			return;

		sLog->outDebug(LOG_FILTER_NETWORKIO, "STORAGE_SIZE: %lu",
				(unsigned long) size());
		for (uint32 i = 0; i < size(); ++i)
			sLog->outDebugInLine("%u - ", read<uint8>(i));
		sLog->outDebug(LOG_FILTER_NETWORKIO, " ");
	}

	void textlike() const {
		if (!sLog->IsOutDebug()) // optimize disabled debug output
			return;

		sLog->outDebug(LOG_FILTER_NETWORKIO, "STORAGE_SIZE: %lu",
				(unsigned long) size());
		for (uint32 i = 0; i < size(); ++i)
			sLog->outDebugInLine("%c", read<uint8>(i));
		sLog->outDebug(LOG_FILTER_NETWORKIO, " ");
	}

	void hexlike() const {
		if (!sLog->IsOutDebug()) // optimize disabled debug output
			return;

		uint32 j = 1, k = 1;
		sLog->outDebug(LOG_FILTER_NETWORKIO, "STORAGE_SIZE: %lu",
				(unsigned long) size());

		for (uint32 i = 0; i < size(); ++i) {
			if ((i == (j * 8)) && ((i != (k * 16)))) {
				if (read<uint8>(i) < 0x10) {
					sLog->outDebugInLine("| 0%X ", read<uint8>(i));
				} else {
					sLog->outDebugInLine("| %X ", read<uint8>(i));
				}
				++j;
			} else if (i == (k * 16)) {
				if (read<uint8>(i) < 0x10) {
					sLog->outDebugInLine("\n");

					sLog->outDebugInLine("0%X ", read<uint8>(i));
				} else {
					sLog->outDebugInLine("\n");

					sLog->outDebugInLine("%X ", read<uint8>(i));
				}

				++k;
				++j;
			} else {
				if (read<uint8>(i) < 0x10) {
					sLog->outDebugInLine("0%X ", read<uint8>(i));
				} else {
					sLog->outDebugInLine("%X ", read<uint8>(i));
				}
			}
		}
		sLog->outDebugInLine("\n");
	}

protected:
	size_t _rpos, _wpos;
	std::vector<uint8> _storage;
};

template<typename T>
inline ByteBuffer &operator<<(ByteBuffer &b, std::vector<T> v) {
	b << (uint32) v.size();
	for (typename std::vector<T>::iterator i = v.begin(); i != v.end(); ++i) {
		b << *i;
	}
	return b;
}

template<typename T>
inline ByteBuffer &operator>>(ByteBuffer &b, std::vector<T> &v) {
	uint32 vsize;
	b >> vsize;
	v.clear();
	while (vsize--) {
		T t;
		b >> t;
		v.push_back(t);
	}
	return b;
}

template<typename T>
inline ByteBuffer &operator<<(ByteBuffer &b, std::list<T> v) {
	b << (uint32) v.size();
	for (typename std::list<T>::iterator i = v.begin(); i != v.end(); ++i) {
		b << *i;
	}
	return b;
}

template<typename T>
inline ByteBuffer &operator>>(ByteBuffer &b, std::list<T> &v) {
	uint32 vsize;
	b >> vsize;
	v.clear();
	while (vsize--) {
		T t;
		b >> t;
		v.push_back(t);
	}
	return b;
}

template<typename K, typename V>
inline ByteBuffer &operator<<(ByteBuffer &b, std::map<K, V> &m) {
	b << (uint32) m.size();
	for (typename std::map<K, V>::iterator i = m.begin(); i != m.end(); ++i) {
		b << i->first << i->second;
	}
	return b;
}

template<typename K, typename V>
inline ByteBuffer &operator>>(ByteBuffer &b, std::map<K, V> &m) {
	uint32 msize;
	b >> msize;
	m.clear();
	while (msize--) {
		K k;
		V v;
		b >> k >> v;
		m.insert(make_pair(k, v));
	}
	return b;
}

// TODO: Make a ByteBuffer.cpp and move all this inlining to it.
template<> inline std::string ByteBuffer::read<std::string>() {
	std::string tmp;
	*this >> tmp;
	return tmp;
}

template<>
inline void ByteBuffer::read_skip<char*>() {
	std::string temp;
	*this >> temp;
}

template<>
inline void ByteBuffer::read_skip<char const*>() {
	read_skip<char*>();
}

template<>
inline void ByteBuffer::read_skip<std::string>() {
	read_skip<char*>();
}
#endif
